Spring contact strips and greenhouse: what they have in common

1. Step 1. Spring contact strips — is part of — Breadboard. Spring contacts under the holes.
2. Step 2. Breadboard — uses — Electrical conduction. Contact strips.
3. Step 3. Electrical conduction — is used in — Silver. The best conductor.
4. Step 4. Silver — is material for — Wall mirror. Silvering.
5. Step 5. Wall mirror — has part — Window glass. Sheet glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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